Munin vs Lighttpd

[Sancho Virág Attila]

My Munin server has been stopping a few days ago with "500 - Internal Server Error" message. All other web services are working.

I attached the log from Lighttpd, I see fastcgi errors. What do you think, what is the problem?

/var/log/lighttpd/error.log

2013-06-02 00:44:00: (log.c.166) server started 

2013-06-02 00:44:00: (server.c.987) WARNING: unknown config-key: accesslog.filename (ignored) 

2013-06-02 00:44:44: (mod_fastcgi.c.2543) unexpected end-of-file (perhaps the fastcgi process died): pid: 15734 socket: unix:/var/run/lighttpd/munin-cgi-html.sock-3 

2013-06-02 00:44:44: (mod_fastcgi.c.3329) response not received, request sent: 1187 on socket: unix:/var/run/lighttpd/munin-cgi-html.sock-3 for /munin-cgi/munin-cgi-html?, closing connection 

2013-06-02 00:44:44: (mod_fastcgi.c.2543) unexpected end-of-file (perhaps the fastcgi process died): pid: 15733 socket: unix:/var/run/lighttpd/munin-cgi-html.sock-2 

2013-06-02 00:44:44: (mod_fastcgi.c.3329) response not received, request sent: 1187 on socket: unix:/var/run/lighttpd/munin-cgi-html.sock-2 for /munin-cgi/munin-cgi-html?, closing connection 

2013-06-02 00:47:18: (mod_fastcgi.c.1732) connect failed: Connection refused on unix:/var/run/lighttpd/munin-cgi-html.sock-3 

2013-06-02 00:47:18: (mod_fastcgi.c.3002) backend died; we'll disable it for 1 seconds and send the request to another backend instead: reconnects: 0 load: 1 

2013-06-02 00:47:24: (mod_fastcgi.c.2543) unexpected end-of-file (perhaps the fastcgi process died): pid: 16257 socket: unix:/var/run/lighttpd/munin-cgi-html.sock-3 

2013-06-02 00:47:24: (mod_fastcgi.c.3329) response not received, request sent: 1187 on socket: unix:/var/run/lighttpd/munin-cgi-html.sock-3 for /munin-cgi/munin-cgi-html?, closing connection